Hi Adobe team,

I’m experiencing repeated, non-reproducible hangs in InDesign 2025 (v20.3.1) when interacting with certain modal dialog panels — such as Panel Options, Color Panel settings, and similar. This occurs on macOS 15.5 (Sequoia). After clicking inside one of these dialogs, InDesign sporadically becomes unresponsive (beachball), requiring a force quit via “Force Quit Applications.”

The issue existed before a complete clean install of macOS and continues to occur even after the fresh system setup with no migration or prior settings carried over.

Here are the key system details:
• macOS version: 15.5 (24F74) – Developer Beta (Sequoia)
• Mac model: MacBook Pro 16” M1 Max, 64 GB RAM
• Displays: Dual Apple Studio Displays
• InDesign version: 20.3.1 (latest Creative Cloud release as of June 2025)
• No plugins installed
• Font manager: RightFont (fonts synced via Dropbox folder, no Adobe plugin)
• User environment: Freshly created custom workspaces
• Documents: Problem occurs even with new, blank files
• macOS was clean-installed from scratch before testing

The hangs are unpredictable and extremely disruptive — multiple times a day — making productive work almost impossible. It’s incredibly frustrating to deal with such instability in basic UI operations like opening panel dialogs.

Attached is a .hang report from macOS, which shows the InDesign main thread stalling in:
UI::ModalDialogManager::RunModalLoop()
BscModalDialog::DoModal()
ControlPanel::ShowOptionsDialog()

Other threads remain idle, indicating a UI-level deadlock — likely caused by a modal dialog waiting on OS-level window interaction that never completes.

This seems related to changes in macOS 15’s window or dialog behavior, potentially affecting how InDesign renders or processes modal components.

I understand Sequoia is still in beta, but since the issue exists in InDesign’s current public release (20.3.1) and is severe enough to disrupt daily work, I wanted to report it early.

Please let me know if you’d like additional crash/hang logs or screen recordings — happy to assist further.

Thanks,
Marc

⸻

PS: This technical explanation and hang report interpretation were created with the help of ChatGPT, since I’m not a developer myself — just a professional user trying to get work done with InDesign.